历史时期分布在北京平原上的泉水与湖泊

历史时期北京平原上湖泊众多,地表泉数以百计。历史时期由于永定河冲积扇的地下潜水水位较高,在潜水溢出带周围出露数以百计的下降泉,成为平原上众多湖泊的主要水源补给,并满足城市规划、园林设计、运河漕运、游憩休闲的需要。随着现代化城市的迅速发展,永定河冲积扇的地下潜水水位迅速下降,原来分布在潜水溢出带周围的数以百计的下降泉已经全部枯竭,位于其下游许多湖泊也随之干涸消亡,北京平原地表水系被彻底改造,城市生态环境发生巨大变化。

Spatial Distribution of the Lakes and Seepage Springs on the Beijing Plain in History

The origin and development of the old Beijing City is closely related with its local surface water system of the alluvial plain.The surface water within or around the city not only was the part of local ecological system,but also provided the needs for the everyday life in the old city,such as the cannel transportation,the landscape garden design,even the city planning.According to the historical documents,more than one-hundred seepage springs and many small lakes were distributed on the Beijing Plain that ...